package Song.Han.day07.demo05;

public class Computer {

    public void powerOn(){
        System.out.println("电脑开机！");
    }

    public void powerOff(){
        System.out.println("电脑关机！");
    }

    //使用USB接口
    public void useDevice(USB usb){

        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse = (Mouse)usb;
            mouse.click();
        }else if (usb instanceof Keyboard){
            Keyboard keyboard = (Keyboard)usb;
            keyboard.type();
        }
        usb.closeDevice();
    }
}
